MAC AFRIC Inside Micrometre 5 – 30 MM

This inside micrometer almosts looks like a pen, but it comes with a thimble that turns. An inside micrometer is used to measure the inside diameter (ID). When it is being used and as the thimble turns, the micrometer expands as a curtain rod would. This then extends until each end of the tool is touching the inside of the pipe. When this happens, you will then use the numbering system on the thimble to find your measurement.